"Looking past the Metro hype, the Build conference also revealed promising road maps for C#, Visual Studio, and the .Net platform as a whole. Perhaps the most exciting demo of the conference for .Net developers, however, was Project Roslyn, a new technology that Microsoft made available yesterday as a Community Technology Preview. Roslyn aims to bring powerful new features to C#, Visual Basic, and Visual Studio, but it's really much more than that. If it succeeds, it will reinvent how we view compilers and compiled languages altogether."

The BASIC interpreter of the Commodore 64 & Commodore 128 were licensed from Microsoft if I'm not mistaken. I think that counts as a successful developer product.

Microsoft BASIC was one of the worst variants going.
Plus nobody used BASIC for serious development, even back then and even on better BASIC implementations.
Developers wrote in machine code.

I don't think their development weren't that bad in general. Ok, maybe Visual Basic was, but only because it was so easy to write bad code with it.

Visual Basic can be pretty much ignored as it's pretty laughable for any serious development and Borland tools were significantly better than VS for quite some time. (IIRC I was still using Borland's C++ Builder in the late 90s)